#include <bits/stdc++.h>
using namespace std;

int main(){
	int n,x,a[100],i;
	cin>>n;
	for(i = 0;i < n;i++){
		cin>>a[i];
	}
	sort(a,a+n);
	
	int p = 0;
	for(i = 0;i < n;i++){
		if(a[i] != 0){
			p = i;
			break;
		}
	}
	
	int t = a[0];
	a[0] = a[p];
	a[p] = t;
	
	for(i = 0;i < n;i++){
		cout<<a[i];
	}
}


/**************************************************************
	Problem: 1452
	User: admin
	Language: C++
	Result: Accepted
	Time:21 ms
	Memory:2076 kb
****************************************************************/